Place a large baking sheet, coated with olive oil spray, in the oven to preheat for about 5 minutes.

In a large bowl, toss cauliflower with canola oil, sesame oil, sesame seeds, salt and pepper. Carefully arrange the cauliflower in a single layer on the baking sheet - place in the oven and roast, stirring once, until tender and browned, about 20 to 30 minutes.